CN211040948U

CN211040948U - Improved structure of circulating fluidized bed

Info

Publication number: CN211040948U
Application number: CN201921174952.XU
Authority: CN
Inventors: 王红; 魏成军; 陈知富; 赵明鑫; 杨月明; 沙子涵; 尤志强
Original assignee: Shenyang Qinghua Boiler Co ltd
Current assignee: Shenyang Qinghua Boiler Co ltd
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2020-07-17
Anticipated expiration: 2029-07-25

Abstract

The utility model discloses an improved structure of a circulating fluidized bed, which comprises cyclone cylinders, wherein the number of the cyclone cylinders is two, furnace flues are arranged on the cyclone cylinders, the furnace flues are directly connected with the interior of the cyclone cylinders, the furnace flues are symmetrically arranged about a boiler central line, reinforcing steel structures are arranged inside the cyclone cylinders, supporting parts of the reinforcing steel are abutted against the first inner walls of the cyclone cylinders, the supporting parts are also abutted against the interior of the furnace flues, the reinforcing steel is provided with rectangular parts, the rectangular parts form second inner walls in the cyclone cylinders, one sides of the rectangular parts are also provided with notches, one ends of the notches are connected with the furnace flues, and the other ends of the notches are connected with the first inner walls in the cyclone cylinders; a central cylinder is eccentrically arranged in the rectangular part; the utility model has the advantages that: the utilization rate of the effective air of the hearth flue with the improved structure is higher, and the air quantity of the primary air and the secondary air is distributed in proportion to control the nitrogen content of the flue gas within an effective range.

Description

Improved structure of circulating fluidized bed

Technical Field

The utility model relates to a fluidized bed combustion field, an improvement structure of burning whirlwind section of thick bamboo specifically says so.

Background

The boiler need be continuous in the burning into the material in order to carry out the supply of fuel, and the in-process of current fluidized bed burning is along with the standard that discharges constantly improves, and the gaseous nitrogen content in fluidized bed also needs to make correspondingly and changes, but the reduction of nitrogen content simultaneously means furnace's inside temperature also need reduce, and how combustion efficiency under the prerequisite that guarantees that nitrogen content does not exceed standard becomes the important topic in fluidized bed burning field.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model discloses a circulating fluidized bed improves structure.

The specific technical scheme is as follows:

an improved structure of a circulating fluidized bed comprises cyclone cylinders, wherein the number of the cyclone cylinders is two, furnace flues are arranged on the cyclone cylinders, the furnace flues are directly connected with the insides of the cyclone cylinders, the furnace flues are symmetrically arranged around a central line of a boiler, a reinforced steel structure is arranged inside the cyclone cylinders, supporting parts of the reinforced steel structure are abutted against the first inner walls of the cyclone cylinders, the supporting parts are also abutted against the inner walls of the furnace flues, the reinforced steel structure is provided with a rectangular part, the rectangular part forms a second inner wall inside the cyclone cylinders, a notch is further arranged on one side of the rectangular part, one end of the notch is connected with the furnace flues, and the other end of the notch is connected with the first inner wall inside; a central cylinder is eccentrically arranged in the rectangular part; part of wind enters the second inner wall, and the other part of wind enters the first inner wall through the gap;

a coal feeding pipe is arranged below the cyclone cylinder, the outlet of the coal feeding pipe is connected to the inside of the cyclone cylinder, a secondary air pipe is further arranged on the outer wall of the cyclone cylinder, the outlet of the secondary air pipe is arranged inside the cyclone cylinder, and the outlet of the secondary air pipe is higher than the outlet of the coal feeding pipe. The utility model has the advantages that: the utilization rate of the effective air of the hearth flue with the improved structure is higher, and the air quantity of the primary air and the secondary air is distributed in proportion to control the nitrogen content of the flue gas within an effective range.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic structural diagram of an original cyclone and a hearth flue;

FIG. 4 is a schematic diagram of a modified secondary air duct;

fig. 5 is a schematic structural diagram of the position of the primary secondary air.

Detailed Description

The present invention is described in detail with reference to the accompanying drawings, as shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, an improved circulating fluidized bed structure includes a cyclone 1, a furnace flue 2 is directly connected to the inside of the cyclone 1, the furnace flue 2 is symmetrically disposed about a boiler centerline, a reinforced steel structure 3 is disposed inside the cyclone 1, a support portion 301 of the reinforced steel structure 3 abuts against a first inner wall 101A of the cyclone 1, the support portion 301 also abuts against the inside of the furnace flue 2, the reinforced steel structure is provided with a rectangular portion 302, the rectangular portion 302 forms a second inner wall 101B inside the cyclone, a notch 302A is further disposed on one side of the rectangular portion 302, one end of the notch 302A is connected to the furnace flue 2, and the other end of the notch 302A is connected to the first inner wall 101A inside the cyclone; the center cylinder 4 is eccentrically disposed inside the rectangular portion 302.

The outer wall of the cyclone barrel 1 is also provided with a secondary air pipe 6, an outlet 601 of the secondary air pipe 6 is arranged inside the cyclone barrel 1, and the outlet height of the secondary air pipe 6 is higher than the outlet 701 of the coal supply pipe 7.

The utility model has the advantages that: after a cyclone cylinder of the existing cyclone separator is modified, a hearth flue enters the interior of the cyclone cylinder, as shown in fig. 2, a part of air enters a second inner wall, a part of air enters a first inner wall through a notch, two air flows are opposite-flushed, the collision of material combustion is effectively increased, the material combustion efficiency is improved, the ratio of secondary air to primary air is 4.5:5.5, the combustion effect is best on the premise that the nitrogen content meets the requirement, the outlet height of a secondary air pipe is higher than that of a coal supply pipe, so that the material can collide more effectively after entering the interior of the cyclone cylinder, and the combustion efficiency is improved.

Claims

1. The utility model provides a circulating fluidized bed improves structure, includes the cyclone, and the quantity of cyclone is two, its characterized in that: the boiler comprises a cyclone, a hearth, a support part, a reinforcing steel structure, a notch, a hearth flue and a boiler, wherein the cyclone is provided with the hearth flue, the hearth flue is directly connected with the inside of the cyclone, the hearth flue is symmetrically arranged around the center line of a boiler, the reinforcing steel structure is arranged inside the cyclone, the support part of the reinforcing steel structure is abutted against the first inner wall of the cyclone, the support part is also abutted against the inner wall of the hearth flue, the reinforcing steel structure is provided with a rectangular part, the rectangular part forms a second inner wall inside the cyclone, one side of the rectangular part is also provided with the notch, one end of the notch is connected with the hearth flue; a central cylinder is eccentrically arranged in the rectangular part; part of wind enters the second inner wall, and the other part of wind enters the first inner wall through the gap;

a coal feeding pipe is arranged below the cyclone cylinder, the outlet of the coal feeding pipe is connected to the inside of the cyclone cylinder, a secondary air pipe is further arranged on the outer wall of the cyclone cylinder, the outlet of the secondary air pipe is arranged inside the cyclone cylinder, and the outlet of the secondary air pipe is higher than the outlet of the coal feeding pipe.